?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Sugandi&rft.au=Asep+Ikin%2C+Sugandi&rft.aulast=Asep+Ikin&rft.atitle=Developing+National+Character+Through+Mathematics+Instruction+Via+Mathematics+Instruction+With+Problem-Based+Learning+In+Jigsaw+Typed+Cooperative+Setting+&rft.date=2011&rft.title=PROCEEDINGS+International+Seminar+and+the+Fourth+National+Conference+on+Mathematics+Education&rft.issn=978-979-16353-7-0&rft.genre=article